Tool and holder therefor



Dec. 5, 1950 J. M. REDINGER 2,533,179

TOOL AND HOLDER THEREFOR Filed May 3, 1949 INVENTOR. fisphMizeclzhger ATTORNEYS- Patented Dec. 5, 1950 r001. AND HOLDER THEREFOR Joseph M. Redinger, Johnston, R. I., assignor to Thurston Manufacturing Company, a corporationof Rhode Island Application May '3, 1949, Serial No. 91,199

This invention relates to a tool, more particularly of the type referred to as an end mill and the holder therefor.

Heretofore, in tools of this character the tool has been inserted into a socket in its holder and rotated relatively to the holder to prevent withdrawal and then held aga'inst reverse rotation vby a collar which squeezed flexible jaws against the tool to prevent an opposite rotary motion which was necessary for withdrawing the tool from its holder.

One of the objects of this invention is to provide a simpler structure for holdin the tool in its holder.

Another object of this invention is to hold the tool against rotation by means of a threaded stud which may extend through the tool holder.

With these and other objects in View, the invention consists of certain novel features of construction, as will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a sectional view through the tool holder and showing the tool located in the holder;

Figure 2 is a sectional view through the tool and its holder in the position which the two assume in being endwise assembled;

Figure 3 is a section such as shown in Figure 2 but showing the tool relatively rotated with reference to the tool holder and held in this position;

Figure 4 is a perspective view of the tool;

Figure 5 is a perspective view of the socket end of the tool holder; and

Figure 6 is a perspective view of a tool having a single end rather than a double end as shown in Figure 4.

In proceeding with this invention I provide on the shank of the tool two fiat surfaces in angular relation to each other. One of these surfaces is spaced inwardly from the ends of the shank to provide shoulders and one of these shoulders is recessed so as to receive a key in the socket of the tool holder of a length equal to the length of the flat surface provided so that it may be positioned opposite the flat surface permitting relative rotation of the tool and holder. A threaded stud is arranged to engage the other flat surface and press against it to lock the tool against a return rotative movement and 1 thus hold the tool so located that the key will prevent extraction of the tool endwise from the holder.

With reference to the drawings, l0 designates generally the tool holder which is provided with I 1 Claim. (Cl. 27.9-83) a cylindrical socket I l formed by abore extending into the holder from one end thereoLwhile a tapered shank I2 is provided with a bore I3 threaded as at M atone end through it for mounting the holder on a spindle or in a rotary chuck of a machine for operation. The bore H is provided with anarrow key I5 spaced inwardly from the end of the bore as shown in Figures 1 and 5 and which is of a short length such as shown in Figure 1. This key may be fixed in the bore The tool which is inserted into this bore or socket is designated generally I6 and is provided with a cylindrical shank ll which is slightly smaller than the diameter of the socket l I so as to easily slide thereinto and is flattened as at 3 on a cord of the cylindrical shank, thus providing shoulders l9 at either end of the flat surface I8. In order that the shank may be slid into position in the socket with the key I5 held therein, a notch 26 is provided in the shoulder l9 centrally of the flat portion formed across the cylindrical shank [1. But one notch 20 is necessary when one end mill 2| as shown in Figure 6 is provided. This notch is also duplicated at the other end of the flat surface l8 when a double end mill having two working ends 2| and 22 is provided, as shown in Figure 4, thus enabling either end of the tool to be inserted in the socket. The length of the key will be slightly smaller although substantially the length of the flat surface I8, thus the shank I! may be inserted into the socket when the notch 20 and the key l5 are in alignment to a location such that the key will be in registry with the recess and flat portion t8, and as the key is of a depth less than the depth of the recess a relative rotation of the tool and socket may be had. Thus, the tool may be rotated from the position of insertion shown in Figure 2 to the position shown in Figure 3 so that the key would engage a shoulder H) were the tool moved in a position to withdraw it from the holder.

In order to prevent the tool from rotating after moved to the position shown in Figure 3, I have provided a second recess or flat portion 23 forming a chord across a different are of the shank and at an angle to the flat surface "3 and preferably this relationship would be so that the planes of the surface It and 23 would be at sixty degrees to one another or in other words the center of the surface 23 will be oriented around the axis of the tool one hundred twenty degrees from the center of the surface [8. A threaded stud 24 engages a threaded opening 25 in the socket and this opening 25 is so located with reference to the key I5 that when the tool is inserted and the stud turned inwardly the stud will engage the flat surface 23 at such a location that it will tend to slightly further rotate the tool and keep it snugly against the key 15, as is shown in Figure 3. The angular relation between radial lines passing through the axis of the stud 24 and passing through the center of the key will be therefore somewhat greater than one hundred twenty degrees.

By this simple arrangement the tool may be inserted into the socket by the notch passing the key and then will be turned slightly relative to the socket so that should withdrawal be attempted the end of the key will engage shoulder 19. The tool will be held in this second position by merely turning inwardly the stud of the toolv holder against the flat surface 23 of the tool thus firmlylocking the parts together and preventing any axial removal of the tool.

I claim: In combination a tool holder having a cylindrical socket, a key projecting into said socket and spaced from the entrance end thereof, a tool having a cylindrical shank to enter said socket and have a rotatable bearing therein, said shank being recessed to provide two fiat surfaces each extending as a cord of the cylindrical shank,

one of the recesses being also spaced from the ends of the shank to provide abutment shoulders of a distance apart substantially the length of said key, one of said abutment shoulders having a notch therein of a size to permit said key to pass endways therethrough on insertion of the shank into the socket whereupon the shank may be relatively rotated to bring the shoulder at one side of the notch into a position to be engaged by the end of the key and prevent removal of the shank from the socket and a threaded stud in the wall of the socket movable to project its end into the socket at a location to engage the other of said recesses and prevent relative return rotation for alignment of said notch and key.

JOSEPH M. REDINGER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,702,132 Redinger Feb. 12, 1929 1,715,097 Redinger May 28, 1929 1,889,571 Redinger Nov. 29, 1932 2,283,514 Stanworth May 19, 1942 

